The small Lancairs (235, 320, 360) have small tires and little ground clearance at the prop. With the original rubber-donut landing gear, the ride was fairly harsh on pavement with expansion joints. With the oleo dampers (debongers), the ride is much better. Also, my landing skills improved markedly at the same time that I installed the debongers. 

I fly a 235 airframe with a high-compression O-320 engine (~170 HP). 

On pavement, I like to have 3000' for landing, and 2000'+ for takeoff. 

A constant speed prop can reduce that by adding more drag in landing configuration.

On hardpacked, smooth dirt, the same requirements apply. I have operated from smooth hard dirt many times. 

On soft turf, I would be worried about the 3.5" wide 50psi tires digging in, making ruts, and contributing too much rolling friction for a safe takeoff, or possibly jamming grass or mud into the brakes. The outback landing gear might help with turf runways, but I think it is too bulky for the 235 wing, so it is found only on 320/360 airframes, as far as I know. 

In my opinion, 2000' is too short for a 235 making less than 150 HP and weighing 1300-1400 lbs.  

Santa Paula airport, where Lance developed the 235 has a 2700' runway, and a river at one end. 

-bob mackey